Robin Chapman's user avatar
Robin Chapman's user avatar
Robin Chapman's user avatar
Robin Chapman
  • Member for 14 years, 1 month
92 votes
Accepted

Are the rationals homeomorphic to any power of the rationals?

82 votes

Is there a dense subset of the real plane with all pairwise distances rational?

44 votes
Accepted

Function with range equal to whole reals on every open set

43 votes
Accepted

Largest number of vectors with pairwise negative dot product

37 votes
Accepted

Finite nonabelian groups of odd order

35 votes

Can Cantor set be the zero set of a continuous function?

34 votes
Accepted

Shortest/Most elegant proof for $L(1,\chi)\neq 0$

31 votes

Can the circle be characterized by the following property?

31 votes
Accepted

Is every field the field of fractions of an integral domain?

30 votes

Which number fields are monogenic? and related questions

29 votes
Accepted

When is sin(r \pi) expressible in radicals for r rational?

26 votes
Accepted

Cardinality of the permutations of an infinite set

25 votes

Commutative subalgebras of M_n

23 votes

Why is an elliptic curve a group?

21 votes

Does Smith normal form imply PID?

20 votes
Accepted

Is completeness of a field an algebraic property?

20 votes

$A_5$-extension of number fields unramified everywhere

19 votes

How to show that x-y is Lebesgue-Lebesgue measurable

19 votes
Accepted

Galois group of a product of irreducible polynomials

19 votes

Good books on theory of distributions

18 votes
Accepted

Conjugating a subgroup of a group into a proper subgroup of itself

18 votes
Accepted

Long line fundamental groupoid

17 votes

Which elements in SL2(Q) are conjugated to an element in SL2(Z)

17 votes
Accepted

What is an antiequivalence of two categories?

17 votes
Accepted

Order types of positive reals

17 votes

How does one use the Poisson summation formula?

17 votes
Accepted

Maximal Ideals in the ring k[x1,...,xn ]

16 votes
Accepted

Semisimple-ish rings!

15 votes

Can SO_n(R) be approximated arbitrarily well using a discrete subgroup?

15 votes
Accepted

Injective maps $\mathbb{R}^{n} \to \mathbb{R}^{m}$

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